CN103994785A - Sensing monitoring device and method based on weak fiber bragg grating array - Google Patents

Sensing monitoring device and method based on weak fiber bragg grating array Download PDF

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CN103994785A
CN103994785A CN 201410232267 CN201410232267A CN103994785A CN 103994785 A CN103994785 A CN 103994785A CN 201410232267 CN201410232267 CN 201410232267 CN 201410232267 A CN201410232267 A CN 201410232267A CN 103994785 A CN103994785 A CN 103994785A
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array
fbg
light
optical
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CN103994785B (en )
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姜德生
许儒泉
程乘
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武汉理工大学
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Abstract

The invention provides a sensing monitoring device and method based on a weak fiber bragg grating array in order to solve the problems of large crosstalk noise between fiber bragg grating sensors, complex network structure and high system manufacturing cost of the existing fiber bragg grating sensing network technology. By controlling a pulse width of an input optical pulse, time duration of the optical pulse is larger than that of light reflection between two adjacent gratings in the weak fiber bragg grating array, forwardly-transmitted light interferes with reflected light between the two adjacent fiber bragg gratings, the system inquires an interference signal accurately to complete addressing and monitoring on the weak fiber bragg grating array, therefore, a signal to noise ratio between the fiber bragg grating sensors is increased, the sensing network structure is simplified, and cost is reduced.

Description

一种基于弱光纤光栅阵列的传感监测装置和传感方法 Based on weak fiber grating array sensor monitoring device and sensing methods

技术领域 FIELD

[0001] 本发明属于传感监测技术领域,具体涉及一种基于弱光纤光栅阵列的传感监测装置和方法。 [0001] The present invention belongs to the sensor monitoring technology, and in particular relates to a sensor monitoring apparatus and method based on a weak FBG array.

背景技术 Background technique

[0002] 光纤传感器具有质量轻、耐高温、耐腐蚀、抗电磁干扰、现场无源等优点,能工作在高温高压、火灾等一般人无法到达的环境,比传统电类传感器具有更广阔的应用前景。 [0002] optical fiber sensor having a light weight, high temperature, corrosion, resistance to electromagnetic interference, scene passive, etc., can operate in the general high temperature and pressure, such as a fire can not reach the environment, has broad application prospects than conventional electrical type sensor .

[0003]目前光纤光栅传感监测技术中所使用的匹配光纤光栅与传感光栅比较标定的方法,这种方法受到匹配光栅与传感光栅实际制造中工艺差别的限制,光纤光栅传感器之间的串扰噪声较大,另外,传感网络复杂,系统造价昂贵。 [0003] Current methods to match fiber grating and the sensing grating Comparative calibrated Fiber Grating Sensor used, this method is limited by the matching process different grating actual manufacturing grating and the sensing of, between the FBG sensors crosstalk noise is large, Furthermore, the sensor network complexity, the system expensive. 同时其他通过弱光栅串联成网的方法,网络规模受到光栅反射率的限制,但弱光栅反射率过弱又会造成传感信号不强,对信号的探测与解调造成极大的难度。 While the other series by the weak grating method into a network, network size is limited by the grating reflectivity, but weak grating reflectivity is too weak will cause the sensor signal is not strong, causing great difficulty of detection and demodulation signal. 综上所述,现有光纤光栅传感网络技术中存在的光纤光栅传感器之间的串扰噪声较大、网络结构复杂、系统造价昂贵的缺点,限制了传感网络规模的发展。 As described above, crosstalk noise between the FBG sensor prior FBG sensor network technology exist in a large, complex network structure, the system costly drawbacks, limiting the development of sensor network scale.

发明内容 SUMMARY

[0004] 为解决现有光纤光栅传感网络技术中存在的光纤光栅传感器之间的串扰噪声较大、网络结构复杂、系统造价昂贵的缺点,本发明提供一种基于弱光纤光栅阵列的传感监测装置,实现提高光纤光栅传感器之间信噪比,简化传感网络结构,降低成本的目的。 [0004] In order to solve the conventional FBG sensor network technology exist FBG large crosstalk noise between the sensors, complex network structure, the system costly drawbacks, the present invention provides a method based on a weak sensing fiber grating array monitoring means, improved signal to noise ratio between the fiber Bragg grating sensor, a simplified sensor network structure and reduce costs.

[0005] 为了达到上述发明目的,本发明采取以下技术方案: [0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] 提供一种基于弱光纤光栅阵列的传感监测装置,包括, [0006] provided based on a weak sensor monitoring apparatus FBG array, comprising,

[0007] 光源模块,用于提供相干脉冲光,其脉冲宽度长于弱光纤光栅阵列中相邻两个光纤光栅之间反射所需时间;弱光纤光栅阵列,接收光源模块发出的相干脉冲光,在弱光纤光栅阵列中相邻两个光纤光栅之间的反射光之间发生干涉;光电探测器,置于弱光纤光栅阵列的输出端,探测该干涉信号并传送到控制器;控制器,与光电探测器相连接,用于采集该干涉信号,并对产生该干涉信号的光纤光栅传感器件进行查询。 [0007] The light source module for providing a coherent pulsed light having a pulse width longer than the time required between the two fiber gratings reflecting the adjacent array of weak fiber grating; weak fiber grating array, a coherent pulsed light receiving source module emitted in interference occurs between the reflected light between the two fiber gratings weak adjacent fiber grating array; photodetectors, placed on the output side weak FBG array, detecting the interference signal and transmitted to the controller; a controller, photoelectric detector is connected, for acquiring the interference signal, and generating FBG sensor device of the interference signal query.

[0008] 所述弱光纤光栅阵列为光纤布拉格光栅阵列。 [0008] The weak fiber grating array is a fiber Bragg grating arrays.

[0009] 所述光源模块包括发出相干激光的光源,及在所述光源后设置的光开关,由所述控制器中的脉冲发生器发出电时序信号,脉冲发生器与光开关连接,对光开关进行控制。 [0009] The light source module includes a light source emits a coherent laser beam, and a light switch after said light source is provided, which emit timing signals from said controller pulse generator, a pulse generator and an optical switch connected to light switch control. 所述光源为单波长相干激光光源或多波长相干激光光源。 The light source is a single-wavelength coherent laser light source or the wavelength of the coherent laser light source.

[0010] 为对相干脉冲光进行放大,在所述光开关与所述弱光纤光栅阵列之间设置光放大器,对进入弱光纤光栅阵列之前的相干脉冲光进行放大。 [0010] The coherent pulsed light is amplified, coherent pulse before it enters the weak FBG array of light amplified in the optical switch to the weakly provided an optical amplifier between the optical fiber grating arrays.

[0011] 所述光放大器和弱光纤光栅阵列之间还设置有一个3端口光环行器,所述光放大器的输出端连接光环行器的I端口,光环行器的2端口连接弱光纤光栅阵列,光环行器的3端口连接所述光电探测器。 [0011] The further provided between the optical amplifier and a weak FBG array has a 3-port optical circulator, a second port connected to an output terminal of said optical amplifier connected to the optical circulator I-port optical circulator weak FBG array , 3-port optical circulator is connected to the photodetector.

[0012] 在所述光电探测器输出端和所述控制器的输入端之间还设置有低通滤波器,光电探测器的输出端与低通滤波器的输入端相连接,低通滤波器的输出端与控制器的输入端相连接。 [0012] between said photodetector output and the input of the controller is further provided with a low-pass filter, the input terminal of the output of the photodetector and the low-pass filter is connected, a low pass filter input terminal of the output terminal of the controller.

[0013] 控制器中还设置有数模采集卡,对电信号进行采集。 [0013] The controller is also provided with several mold capture card, the electrical signal acquisition.

[0014] 本发明基于弱光纤光栅阵列的传感监测装置原理为:相干光源经过光开关后被调制为相干脉冲光,光开关由脉冲发生器发出的电时序信号所控制,脉冲发生器由所述控制器进行控制。 [0014] The principles of the invention sensor monitoring apparatus weak FBG array based is: a coherent light source through an optical switch after being modulated coherent pulsed light, electric timing signal optical switch emitted by the pulse generator is controlled, the pulse generator consists of the said controller controls. 经过光开关后的相干脉冲被光放大器放大,继而进入光环行器的I端口,从I端口进入的光信号,由光环行器的2端口输出,输入弱光纤光栅阵列,光信号在弱光纤光栅阵列中各相邻2个光纤光栅之间进行反射光干涉后,干涉信号从光环行器的3端口输出,进入光电探测器,光信号转换为电信号,光电探测器的输出端连接低通滤波器的输入端,被低通滤波器滤波后,信号进入控制器,所述信号由控制器中的数模采集卡所采集,并进行处理,对产生该干涉信号的光纤光栅传感器件进行查询,具体为通过采集不同时间的干涉信号,对光纤光栅阵列传感器件进行地址查询及光波长信息的查询。 After coherent pulses of the optical switch is amplified by an optical amplifier, then enter optical circulator I port, an optical signal I port access from the 2-port output optical circulator input weak fiber grating array, the optical signal is weak FBG an array of adjacent back reflected light interference between the two grating, the interference signal 3 output port optical circulator enter the photodetector, optical signal into an electric signal, the output of the photodetector is connected to the low pass filter input of the filter, after being low-pass filter, the signal enters the controller, the signal acquired by the controller in the digital to analog grabber and processed, the generation of the interference FBG sensor element signals query, specifically, an array of FBG sensor device query address inquiries and information by interference light having a wavelength different from the signal acquisition time.

[0015] 本发明还提供一种基于弱光纤光栅阵列的传感监测方法,包括: [0015] The present invention further provides a sensing monitoring method based on a weak FBG array, comprising:

[0016] 对入射到弱光纤光栅阵列中的相干脉冲光的脉冲宽度进行控制,使该脉冲宽度长于光在相邻两个光纤光栅之间反射所需时间;相邻两个光纤光栅的反射光之间发生干涉,该干涉信号通过光电探测器传送到控制器;控制器采集该干涉信号,并对产生该干涉信号的光纤光栅传感器件进行查询。 [0016] incident on a weak pulse width of the coherent pulsed light array of the optical fiber grating is controlled so that the pulse width is longer than the time required between the two fiber gratings reflect light in adjacent; reflected light two fiber gratings adjacent interference between the interference signal to the controller by the photodetector; controller collects the interference signal, and generating FBG sensor device of the interference signal query.

[0017] 如需对第i个和第i + Ι个光纤光栅干涉信号进行查询,即需要采集时间为 [0017] For the interference signal to query the i-th and i + Ι FBG, i.e. required acquisition time

Figure CN103994785AD00041

的反射光的干涉信号,其中ALi是第i个光栅和第i+Ι个光栅之间的间 The interference signal of the reflected light, wherein ALi is the spacing between the i-th raster and the i + Ι grating

距。 distance. 这个干涉信号包括了前后两个相邻光纤光栅反射光的干涉信号,通过后续的数据处理可以分析传感器所感知的环境参数的变化。 The interference signal comprises front and rear two adjacent interferometric signals FBG reflected light may be analyzed change sensor sensed environmental parameter by subsequent data processing.

[0018] 其中经过光开关调制得到的相干脉冲光,第i个光脉冲的脉冲宽度应为:.η@Α:,其中弱光纤光栅阵列中第i个光栅和第i+Ι个相邻光栅的间距为ALi,neff为光纤的有效折射率,c为真空中的光速。 [0018] wherein after coherent pulsed light obtained by modulating switch, i-th pulse width of the light pulse should be: .η @ Α :, weak fiber grating array wherein the i-th and the i + Ι raster adjacent raster the pitch ALi, neff is the effective refractive index of the optical fiber, c is the light velocity in vacuum.

[0019] 所述对光纤光栅传感器件进行查询具体包括,通过采集不同时间的干涉信号,对光纤光栅阵列传感器件进行地址查询及光波长信息的查询。 [0019] The query FBG sensor device comprises, on the fiber grating array sensor device query address inquiries and light having a wavelength information by interference signals acquired at different times.

[0020] 本发明的有益效果为:实现提高光纤光栅传感器之间信噪比,简化传感网络结构,降低成本的目的。 [0020] Advantageous effects of the present invention are: improved signal to noise ratio between the fiber Bragg grating sensor, a simplified sensor network configuration and cost reduction purposes.

附图说明 BRIEF DESCRIPTION

[0021] 图1是本发明装置的结构示意图。 [0021] FIG. 1 is a schematic view of the inventive device.

具体实施方式 Detailed ways

[0022] 为使本发明的上述目的、特征和优点能够更加明显易懂,下面结合附图对本发明的具体实施例作进一步详细描述: [0022] For the above-described objects, features and advantages of the present invention are more apparent in the following with reference to the specific embodiments of the present invention will be described in further detail:

[0023] 如附图所示,本发明提供的一种基于弱光纤光栅阵列的传感监测装置,包括,光源模块,用于提供相干脉冲光,其脉冲宽度长于弱光纤光栅阵列中相邻两个光纤光栅之间反射所需时间;弱光纤光栅阵列,接收光源模块发出的相干脉冲光,在弱光纤光栅阵列中相邻两个光纤光栅之间的反射光之间发生干涉;光电探测器,置于弱光纤光栅阵列的输出端,探测该干涉信号并传送到控制器;控制器,与光电探测器相连接,用于采集该干涉信号,并对产生该干涉信号的光纤光栅传感器件进行查询。 [0023] As shown in the drawings, one inventive provided based sensor monitoring apparatus weak FBG array comprising, a light source module for providing a coherent pulsed light having a pulse width longer than the weak fiber grating array adjacent two between the optical fiber grating reflects the time required; interference between the reflected light between the two fiber gratings weak fiber grating array, receiving coherent pulsed light source module is emitted, adjacent weak FBG array; photodetectors, placed weak FBG array output end, the detection of the interference signal and transmitted to the controller; a controller, connected to the photodetector for collecting the interference signal, and generating FBG sensor device of the interference signal query .

[0024] 所述弱光纤光栅阵列为光纤布拉格光栅阵列。 [0024] The weak fiber grating array is a fiber Bragg grating arrays. 本发明实施例中,弱光栅阵列是由多个具有极低反射率的光纤布喇格光栅组成,其中光栅的反射率在0.1〜1%。 Embodiments of the present invention, the weak grating array is a fiber Bragg grating consisting of a plurality of having a very low reflectance composition, reflectivity which grating is 0.1~1%. 量级,波长范围在光源的波长范围内。 The order of the wavelength range in the wavelength range of the light source.

[0025] 所述光源模块包括发出相干激光的光源,及在所述光源后设置的光开关,由所述控制器中的脉冲发生器发出电时序信号,脉冲发生器与光开关连接,对光开关进行控制。 [0025] The light source module includes a coherent laser light source, and an optical switch disposed after the light source, emits an electrical signal generated by said timing pulse generator controller, pulse generator connected to the optical switch, the optical switch control. 所述光源为单波长相干激光光源或多波长相干激光光源。 The light source is a single-wavelength coherent laser light source or the wavelength of the coherent laser light source. 本发明实施例中,光源使用相干梳状光源。 Embodiment, the light source a coherent comb light source of the present invention.

[0026] 本发明实施例中,光开关采用SOA光开关。 Embodiment [0026] of the present invention, the optical switch using the SOA optical switch. 还可以使用基于AOM的光开关或基于EAM的光开关或者EOM光开关。 Or an optical switch may also be used EOM EAM based optical switch or an optical switch based on the AOM. 光开关受到控制器的控制,控制输入光脉冲的时间长度,使得光脉冲的持续时间大于相邻两个光栅之间的反射的长度,则相邻两个光栅的反射信号形成干涉。 An optical switch controlled by the controller, the length of time the control input optical pulse, so that the duration of the light pulse is greater than an adjacent length of the reflector between the two gratings, the reflected signals of the two gratings is formed adjacent interference.

[0027] 为对相干脉冲光进行放大,在所述光开关与所述弱光纤光栅阵列之间设置光放大器,对进入弱光纤光栅阵列之前的相干脉冲光进行放大。 [0027] The coherent pulsed light is amplified, coherent pulse before it enters the weak FBG array of light amplified in the optical switch to the weakly provided an optical amplifier between the optical fiber grating arrays.

[0028] 本发明实施例中,光放大器使用掺铒光纤放大器。 Embodiment, the optical amplifier using erbium-doped fiber amplifiers [0028] the present invention. 或者根据工作波长的需要,也可以采用掺镨光纤放大器,或者通过半导体光放大器实现。 Or as required operating wavelength, it can also be employed praseodymium-doped fiber amplifier, or implemented by a semiconductor optical amplifier.

[0029] 所述光放大器和弱光纤光栅阵列之间还设置有一个3端口光环行器,所述光放大器的输出端连接光环行器的I端口,光环行器的2端口连接弱光纤光栅阵列,光环行器的3端口连接所述光电探测器。 [0029] The further provided between the optical amplifier and a weak FBG array has a 3-port optical circulator, a second port connected to an output terminal of said optical amplifier connected to the optical circulator I-port optical circulator weak FBG array , 3-port optical circulator is connected to the photodetector.

[0030] 在所述光电探测器输出端和所述控制器的输入端之间还设置有低通滤波器,光电探测器的输出端与低通滤波器的输入端相连接,低通滤波器的输出端与控制器的输入端相连接。 [0030] between said photodetector output and the input of the controller is further provided with a low-pass filter, the input terminal of the output of the photodetector and the low-pass filter is connected, a low pass filter input terminal of the output terminal of the controller.

[0031 ] 控制器中还设置有数模采集卡,对光电探测器输出的电信号进行采集。 [0031] The controller is also provided with several mold capture card, the electrical signal of the photodetector output is collected.

[0032] 本发明还提供一种基于弱光纤光栅阵列的传感监测方法,包括: [0032] The present invention further provides a sensing monitoring method based on a weak FBG array, comprising:

[0033] 对入射到弱光纤光栅阵列中的相干脉冲光的脉冲宽度进行控制,使该脉冲宽度长于光在相邻两个光纤光栅之间反射所需时间;相邻两个光纤光栅之间的反射光之间发生干涉,该干涉信号通过光电探测器传送到控制器;控制器采集该干涉信号,并对产生该干涉信号的光纤光栅传感器件进行查询。 [0033] incident on a weak pulse width of the coherent pulsed light fiber grating array is controlled so that the pulse width is longer than the time required between the two fiber gratings reflect light in adjacent; between the two fiber gratings adjacent interference occurs between the reflected light, the interference signal to the controller by the photodetector; controller collects the interference signal, and generating FBG sensor device of the interference signal query.

[0034] 本发明实施例中,弱光栅阵列是由多个具有极低反射率的光纤布喇格光栅组成,光源模块包括发出连续相干光的相干梳状光源,及在所述光源后设置的光开关,由所述控制器中的脉冲发生器发出电时序信号,对光开关进行控制,光开关采用SOA光开关。 [0034] The embodiments of the present invention, the weak grating array is a fiber Bragg grating consisting of a plurality of having a very low reflectance composition, light source module includes issuing a coherent comb source of continuous coherent light, and provided at the rear of the light source an optical switch, which emit timing signals from said controller pulse generator, for controlling the optical switch, the optical switch using the SOA optical switch. 光开关受到控制器的控制,控制输入光脉冲的时间长度,使得光脉冲的持续时间大于光相邻两个光栅之间的反射的长度,则相邻两个光栅的反射信号形成干涉。 An optical switch controlled by the controller, the length of time the control input optical pulse, so that the duration of the light pulse length is reflected between the two gratings is greater than the adjacent light, reflected signals of the two gratings is formed adjacent interference. 在光开关与所述弱光纤光栅阵列之间设置掺铒光纤放大器,光放大器和弱光纤光栅阵列之间还设置有一个3端口光环形器,所述光放大器连接光环行器的I号端口,光环行器的2号端口连接弱光纤光栅阵列,光环行器的3端口连接所述光电探测器。 Weak optical switch disposed between the erbium doped fiber grating array is also provided with a 3-port optical circulator between the optical fiber amplifiers, optical amplifiers and fiber grating array is weak, the optical amplifier connected to port I, optical circulator, port 2 of optical circulator is connected to a weak FBG array, the third port connected to said photodetector optical circulator. 光电探测器输出端和所述控制模块的输入端之间还设置有低通滤波器。 It is also provided with a low-pass filter between the photodetector output and input of the control module. 将低于所设频率的信号滤掉。 Signal is lower than the set frequency filtered. 控制器中设置有数模采集卡,对光电探测器输出的电信号进行采集。 Controller provided with several mold capture card, to the photodetector output electrical signal acquisition.

[0035] 其中经过光开关调制得到的相干脉冲光,第i个光脉冲的脉冲宽度应为: ≥2 Δ Li.rid/c,其中弱光纤光栅阵列每相邻光栅的间距为ALi, neff为光纤的有效折射 [0035] wherein after coherent pulsed light switch modulation obtained by i-th pulse width of the light pulse should be: ≥2 Δ Li.rid / c, where a weak FBG arrays each adjacent grating pitch ALi, neff is effective refractive optical fiber

率,c为真空中的光速。 Rate, c is the light velocity in vacuum.

[0036] 所述对光纤光栅传感器件进行查询具体包括,通过采集不同时间的干涉信号,对光纤光栅阵列传感器件进行地址查询及光波长信息的查询。 [0036] The query FBG sensor device comprises, on the fiber grating array sensor device query address inquiries and light having a wavelength information by interference signals acquired at different times.

[0037] 本发明提供一种基于弱光纤光栅阵列的传感监测装置和方法,通过控制输入光脉冲的脉冲宽度,使得光脉冲的持续时间大于弱光纤光栅阵列中相邻两个光栅之间光反射的时间长度,相邻两个光纤光栅之间的前向传输光和反射光之间发生干涉,系统对干涉信号进行精确的查询,完成对弱光纤光栅阵列的寻址与监测,进而实现了提高光纤光栅传感器之间信噪比,简化传感网络结构,降低成本的目的。 [0037] The present invention provides a sensor monitoring apparatus and method for an optical fiber grating array based on weak, by controlling the pulse width of the input optical pulse, so that the duration of the light pulse is greater than the weak light between two gratings adjacent arrays FBG the length of time reflected by the adjacent interference front between the two fiber gratings to between the transmission light and the reflected light, the system of the interference signal accurately query to complete the addressing and monitoring weak FBG arrays, thus achieving noise ratio between the sensor fiber Bragg grating, to simplify the sensor network structure and reduce costs.

Claims (10)

  1. 1.一种基于弱光纤光栅阵列的传感监测装置,其特征在于,包括: 光源模块,用于提供相干脉冲光,其脉冲宽度长于弱光纤光栅阵列中相邻两个光纤光栅之间反射所需时间; 弱光纤光栅阵列,接收光源模块发出的相干脉冲光,在弱光纤光栅阵列中相邻两个光纤光栅之间的反射光之间发生干涉; 光电探测器,置于弱光纤光栅阵列的输出端,探测该干涉信号并传送到控制器;控制器,与光电探测器相连接,用于采集该干涉信号,并对产生该干涉信号的光纤光栅传感器件进行查询。 1. Based on Weak sensor monitoring apparatus FBG array, characterized by comprising: a light source module for providing a coherent pulsed light having a pulse width longer than the reflections between the two fiber gratings adjacent array weak FBG the time required; weak fiber grating array, interference between the reflected light between the two fiber gratings coherent pulsed light receiving source module emitted, adjacent weak FBG array; photodetectors, placed weak FBG array an output terminal, the detection of the interference signal and transmitted to the controller; a controller, connected to the photodetector for collecting the interference signal, and generating FBG sensor device of the interference signal query.
  2. 2.根据权利要求1所述的基于弱光纤光栅阵列的传感监测装置,其特在于,所述弱光纤光栅阵列为光纤布拉格光栅阵列。 The sensor monitoring apparatus FBG array based on weak according to claim 1, which Laid wherein said low fiber grating array is a fiber Bragg grating arrays.
  3. 3.根据权利要求1所述的基于弱光纤光栅阵列的传感监测装置,其特征在于,所述光源模块包括发出相干激光的光源,及在所述光源后设置的光开关,由所述控制器中的脉冲发生器发出电时序信号,脉冲发生器与光开关连接,对光开关进行控制。 The sensor monitoring apparatus FBG array based on weak according to claim 1, characterized in that the light source module comprises a light source emits a coherent laser beam, and a light switch after said light source is provided, by the control is the pulse generator emits an electrical timing signal, a pulse generator and optical switches, and controls the optical switch.
  4. 4.根据权利要求3所述的基于弱光纤光栅阵列的传感监测装置,其特征在于,所述光源为单波长相干激光光源或多波长相干激光光源。 4. The sensor monitoring apparatus FBG array based on a weak claim according to claim 3, characterized in that the light source is a single-wavelength coherent laser light source or the wavelength of the coherent laser light source.
  5. 5.根据权利要求4所述的基于弱光纤光栅阵列的传感监测装置,其特征在于,还包括光放大器,设置于所述光开关与所述弱光纤光栅阵列之间,对进入弱光纤光栅阵列之前的相干脉冲光进行放大。 According to claim 4, wherein based on weak fiber grating array sensor monitoring device, characterized by further comprising an optical amplifier provided on the light switch and the weak fiber grating array between entering weak fiber grating before the array of coherent pulsed light is amplified.
  6. 6.根据权利要求5所述的基于弱光纤光栅阵列的传感监测装置,其特征在于,所述光放大器和弱光纤光栅阵列之间还设置有一个3端口光环行器,所述光放大器的输出端连接光环行器的I端口,光环行器的2端口连接弱光纤光栅阵列,光环行器的3端口连接所述光电探测器。 The sensor monitoring apparatus FBG array based on weak claimed in claim, wherein, further provided with a three-port optical circulator between said optical amplifier and a weak FBG array, said optical amplifier 2 port weak FBG arrays, optical circulator I port optical circulator connected to the output of the optical circulator port 3 is connected to the photodetector.
  7. 7.根据权利要求1所述的基于弱光纤光栅阵列的传感监测装置,其特征在于,在所述光电探测器输出端和所述控制器的输入端之间还设置有低通滤波器,光电探测器的输出端与低通滤波器的输入端相连接,低通滤波器的输出端与控制器的输入端相连接。 The sensor monitoring apparatus based on a weak FBG array according to claim 1, wherein the further low-pass filter provided between said photodetector output and the input of the controller, the output of the photodetector and the input terminal of the low pass filter is connected to the input terminal of the low pass filter output terminal is connected with the controller.
  8. 8.一种基于弱光纤光栅阵列的传感监测方法,其特征在于,包括: 对入射到弱光纤光栅阵列中的相干脉冲光的脉冲宽度进行控制,使该脉冲宽度长于光在任一相邻两个光纤光栅之间反射所需时间; 相邻两个光纤光栅之间的反射光之间发生干涉,该干涉信号通过光电探测器传送到控制器; 控制器采集该干涉信号,并对产生该干涉信号的光纤光栅传感器件进行查询。 8. Based on the weak sensing monitoring method FBG array, characterized by comprising: incident to the pulse width of the coherent pulsed light is weak fiber grating array is controlled so that the pulse width is longer than the light at any two adjacent the time required between the optical fiber reflective grating; between the reflected light between the two adjacent fiber gratings interfere, the interference signal to the controller by the photodetector; controller collects the interference signal, and generating the interference FBG sensor device signals query.
  9. 9.根据权利要求8所述的基于弱光纤光栅阵列的传感监测方法,其特征在于,经过光开关调制得到的相干脉冲光,第i个光脉冲的脉冲宽度应为4≥2ALi.nrff/c,其中弱光纤光栅阵列中第i个光栅与第i+Ι个光栅的间距为ALi, neff为光纤的有效折射率,c为真空中的光速。 According to claim sensing monitoring method weak FBG array-based, wherein said 8, coherent pulsed light passes through the optical switch modulation obtained by i-th pulse width of the light pulse should be 4≥2ALi.nrff / c, where a weak fiber grating array i-th raster and the first i + Ι grating pitch of ALi, neff is the effective refractive index of the optical fiber, c is the speed of light in vacuum.
  10. 10.根据权利要求9所述的基于弱光纤光栅阵列的传感监测方法,其特征在于,所述对光纤光栅传感器件进行查询具体包括,通过采集不同时间的干涉信号,对光纤光栅阵列传感器件进行地址查询及光波长信息的查询。 According to claim 9 based on weak fiber grating array sensor monitoring method, wherein the FBG sensor devices to query specifically including by collecting different times of the interference signal, FBG array sensor devices query address lookup and optical wavelength information.
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